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2 October, 18:18

If you have 39 g of sodium azide in an air bag [2nan3 (s) - > 2na (s) + 2n2 (g) ], then how many molecules of nitrogen gas will it make at stp?

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  1. 2 October, 21:04
    0
    Sodium Azide in an air bag = 39g

    Converting the given grams in to moles, that is 1 mole = 65 grams

    Sodium Azide in moles = 0.6

    From the equation there are 2 moles of Sodium Azide and there are 3 moles of N

    Calculating the N2 in moles = (3 x 0.6) / 2 = 0.9 moles of N2

    Calculating the molecular mass of N = 0.90 x 6.022 x 10^23 = 5.42 x 10^23.
  2. 2 October, 21:46
    0
    2nan3 - - >2na + 3h2

    calculate the moles of nan3 = 39/65=0.6 moles

    the reacting ratio of nan3 to h2 is 2:3 therefore the mole of h2 formed is (0.6 x3) / 2=0.9 moles

    using the avogadros law

    1 mole=6.02 x 10^23, what about 0.9 moles

    =0.9 x (6.02 x10^23) = 5.418 x 10^23
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